Design and Preparation of NiFeO@FeOOH Composite Electrocatalyst for Highly Efficient and Stable Oxygen Evolution Reaction.

Rational design and constructing earth-abundant electrocatalysts for efficient electrocatalytic water splitting is a crucial challenge. Herein, we report a simple and efficient one-step electrochemical synthetic route of the NiFeO@FeOOH composite electrocatalyst for the oxygen evolution reaction. The unique morphology of the NiFeO nanoflowers loaded on FeOOH nanosheets allows more active sites to be exposed and promote charge transfer as well as gas release, and the resulting electrode enables a current density of 10 mA cm at a low overpotential of 255 mV with outstanding stability at a current density of 100 mA cm for 300 h.